Nice dha, Nathaniel. This is one of those interesting cross-pollenated pieces that you see so often in the region. As Stuart pointed out, there are strong Kachin influences, namely the square/concave tip (hard to tell which on the older ones that have been worn down). The blade curve, grip style, and scabbard style are Bama (Burman), however.
The typical Kachin utility dha has a flared grip, and a short, very broad, essentially straight blade, though you could say that there is some blade curvature due to a different sweep of the edge and spine blade.
The "fighting" Kachin dha on the other hand has a long, straight blade and a simple, unflared handle like yours.
Both have a square/concave tip. Shagreen is not very common on Kachin sword dha (or sword dao, as Egerton calls them), though it is quite common on Bama dha.
